Filter cartridge



FIG. 1 is a perspective view from one end of a filter cartridge incorporating my new design;

FIG. 2 is a perspective view from the other end of the filter cartridge;

FIG. 3 is a side view of the filter cartridge;

FIG. 4 is a top plan view of the filter cartridge; and,

FIG. 5 is a bottom plan view of the filter cartridge. 

The ornamental design for a filter cartridge, as shown. 